Jewel-setting cutter.



, PATENT-ED 001 so 1906. I c. CULMAN. JEWEL SETTING CUTTER.

.APPLIOATION FILED SEPT. 14. 1905.

7 Fig. 5 is an end view of the tool.

' UNITED STATES PATENT OFFICE.

- CARL OULMAN, OF ST. LOUIS, MISSOURI.

JEWEL-SETTING CUTTER.

Specification of Letters Patent.

Patented Oct. 30, 1906.

Application filed September 14,1905, Serial No. 278,511.

scription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same. i

This invention relates to ewel-setting cutters.

The object of the invention is to provide a device of this characterwith which settings or seats of varying diameter may be drilled or cutfor setting jewels or for other purposes.

A further object is to provide a device of this character which may beusedin the tailstock,turrethead, or slide-rest of lathes.

With the above and other objects in view the invention consists ofcertain novel features of construction, combination, and arrangement ofparts, as will be hereinafter described and claimed.

In the accompanying drawings, Figure 1 is a side view of a lathe,showing the tool applied to the tail-stock thereof. Fig. 2 is anenlarged detail side view of the tool removed from the lathe. Fig. 3 isa longitudinal vertical sectional view of the same. Fig. 4 is across-sectional view on a line of the set-screw. Fig. 6 is a side viewof a modified form of tool, and Fig. 7 is an end view of the same.

Beferring to the drawings by numerals, 1 denotes the tool, consisting ofa body portion or shank 2, which is here shown as slightly taperedtoward its inner or attaching end and havin its opposite end s lit orbifurcated, as s own at 5. Throug the tool at the inner end of thebifurcation or split is formed a transversely-disposed aperture 4.

On the bifurcated end of the tool are formed the bits or cutters 5, oneof which is arranged on each side of the split or bifurcation and injuxtaposition to the edge of the same. The cutters, as'shown in Figs. 1to 5 of the drawings, have their cutting edges 6 arranged on the outerside of the bits in position to cut out a seat or setting correspondingto the shape and size of the jewel to be set. In one side of the toolnear the cutting edge of the same is arranged a set-screw 7,

.said .screw being arranged at right angles to the bifurcation or split,and is adapted to be screwed through one half 'of the tool and,

into engagement with the split surface of the other half, whereby whenthe screw is screwed inwardly the bifurcated ends of the tool will besprung or forced apart more or less, thus separating the bits or cutters5 to a greater or less degree, causing them to cut or drill settings orseats of varying diameters.

By providing the transversely-disposed aperture 4 the elasticity oryielding ualities. of the bifurcated ends of the tool W1 1 be increased,and the danger of breaking said ends will be diminished.

In Figs. 6 and 7 of the drawings is shown a modified construction of thetool. In this instance the bits or cutters 8 are formed in juxtapositionto the outer surface of the tool and at substantially diametricallyopposite points, thus forming between them a space which is increased ordiminished by means of the set-screw 7, as will be understood. Thecutting edges 9 of the bits or cutters 8 are arranged on the inner sideof the cutters, as shown. When the cutters or bits are arranged as lastdescribed, the tool is adapted for use for outside cutting, burnishing,&c.

From the foregoing description, taken in connection with theaccompanying drawings, the construction and operation of the inventionwill be readily understood without requiring a more extendedexplanation.

Various changes in the form, proportion, and the minor details ofconstruction may be resorted to without departing from the principle orsacrificing any of the advantages of this invention.

Having thus described my invention, what be expanded, a set-screwarranged in one side of the bifurcated end of the shank at right anglesto said bifurcation, the inner end of said screw bearing on the oppositeside of the my hand in presence of two subscribing bifurcated end,'whereby upon the adjust Witnesses. ment of the screwlinv'vardly oroutwardly,

said bifurcated ends of the shank and the cut- CARL OULMAN' 5 tersthereon may be separated to a greater or Witnesses:

less degree, substantially as described. KARL E. HOLDERLE,

In testimony whereof I have hereunto set W. GOEGGEL.

